All of you coming from out of town, thinking your train will arrive at VT, will be in for a surprise. It will terminate at Dadar. This is due to giant megablock work at Masjid station.
The best option from Dadar is to get on a Western line Local heading toward Churchgate and get off at the next stop which is Grant Rd. Station. Take exit on west. August Kranti is a quick 5 minute walk from there.
For those who want to take a bus from Dadar, from Dadar TT side, buses 92/85/305 go to Nana Chowk. But Nana Chowk is almost Grant Rd station anyway so walk to August Kranti Maidan will be almost the same. Taking train will be much faster.